sklearn.preprocessing.OneHotEncoder, scikit-learn developers, 2024 - Official documentation for Scikit-learn's OneHotEncoder, detailing its parameters and usage for nominal categorical feature encoding.
sklearn.preprocessing.OrdinalEncoder, scikit-learn developers, 2024 - Official documentation for Scikit-learn's OrdinalEncoder, outlining its parameters and usage for ordinal categorical feature encoding.
Hands-On Machine Learning with Scikit-Learn, Keras, and TensorFlow, Aurélien Géron, 2022 (O'Reilly Media) - A practical guide covering data preprocessing, including a detailed discussion on various categorical encoding techniques with implementation examples using Scikit-learn.